公路软基先预压后开挖换填轻质土技术的设计计算方法研究

高速公路工程采用先预压后开挖换填轻质土方法进行软基处理，当预压时间不足时需要通过施工过程中动态调整轻质土换填量来保证同等效果。以温州绕城高速西南线软基处理工程为例，研究了先预压后开挖换填轻质土处理技术工后沉降和换填厚度的设计计算方法，以及通过荷载的等效换算，来对轻质土换填量作出动态调整的计算方法。工程应用效果表明，该方法可以在缩短预压时间的基础上有效控制工后沉降。

Design and Calculation Methods of Light Soil Replacement after Preloading in the Soft Soil Foundation of the Highway

The soft foundation improvement is carried out by the method of light soil replacement after preloading, it is necessary to dynamically adjust the light replacement amount during the construction process to ensure the same treatment results if the preloading time is insufficient. Taking the project of the southwest line of Wenzhou Ring Expressway as an example, the complete design and calculation methods were introduced in this paper and the dynamic conversion of the load was used to dynamically adjust the weight of light soil replacement. Results of engineering application shown that the method can effectively control post-construction settlement based on shortening the preloading time.